FL-41 Lenses use a precision rose-colored tint to filter out specific wavelengths of blue-green light (roughly 480–520 nm) that are known to trigger or worsen migraines and photophobia 

FL-41 lenses are specifically designed to address neurological light sensitivity rather than general digital eye strain.

Targeted Filtration: They block approximately 80% of the blue wavelengths that trigger eye pain, dizziness, and headaches, particularly those emitted by fluorescent lights and digital screens

Symptom Relief: Beyond reducing attack frequency, they can lower photophobia severity scores by roughly 65% and allow for longer reading duration under harsh lighting.

Indoor vs. Outdoor Use: Lighter tints (approx. 25–50%) are ideal for indoor office environments to combat fluorescent flicker, while darker or polarized versions (approx. 75–80%) are tailored for bright sunlight.

Tokai CCP400 (Contrast Control Protection) lenses are specialized medical filters designed to reduce glare and enhance contrast by suppressing high-energy blue light. Developed by Tokai Optical in Japan, these lenses specifically target the wavelengths below 500nm, which is often responsible for visual discomfort and glare in individuals with certain eye conditions.  

Enhanced Contrast: By removing scattered blue light, the lenses sharpen the edges of objects and improve depth perception.

Reduced Eye Fatigue: Minimise the energy consumed by the eyes when trying to focus in glary or high-brightness environments.

UV and HEV Protection: Provides 100% protection against harmful UV rays and high-energy violet light.

Natural Colour Perception: Despite the tint, they are designed to maintain a relatively natural visual environment.